94 lines
2 KiB
C
94 lines
2 KiB
C
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/*
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* Suspend/resume support
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*
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* Copyright 2009 MontaVista Software, Inc.
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*
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* Author: Anton Vorontsov <avorontsov@ru.mvista.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#include <linux/init.h>
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#include <linux/types.h>
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#include <linux/errno.h>
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#include <linux/export.h>
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#include <linux/suspend.h>
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#include <linux/delay.h>
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#include <linux/device.h>
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#include <linux/of_address.h>
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#include <linux/of_platform.h>
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struct pmc_regs {
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__be32 devdisr;
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__be32 devdisr2;
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__be32 :32;
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__be32 :32;
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__be32 pmcsr;
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#define PMCSR_SLP (1 << 17)
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};
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static struct device *pmc_dev;
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static struct pmc_regs __iomem *pmc_regs;
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static int pmc_suspend_enter(suspend_state_t state)
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{
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int ret;
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setbits32(&pmc_regs->pmcsr, PMCSR_SLP);
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/* At this point, the CPU is asleep. */
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/* Upon resume, wait for SLP bit to be clear. */
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ret = spin_event_timeout((in_be32(&pmc_regs->pmcsr) & PMCSR_SLP) == 0,
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10000, 10) ? 0 : -ETIMEDOUT;
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if (ret)
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dev_err(pmc_dev, "tired waiting for SLP bit to clear\n");
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return ret;
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}
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static int pmc_suspend_valid(suspend_state_t state)
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{
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if (state != PM_SUSPEND_STANDBY)
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return 0;
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return 1;
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}
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static const struct platform_suspend_ops pmc_suspend_ops = {
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.valid = pmc_suspend_valid,
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.enter = pmc_suspend_enter,
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};
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static int pmc_probe(struct platform_device *ofdev)
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{
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pmc_regs = of_iomap(ofdev->dev.of_node, 0);
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if (!pmc_regs)
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return -ENOMEM;
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pmc_dev = &ofdev->dev;
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suspend_set_ops(&pmc_suspend_ops);
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return 0;
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}
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static const struct of_device_id pmc_ids[] = {
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{ .compatible = "fsl,mpc8548-pmc", },
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{ .compatible = "fsl,mpc8641d-pmc", },
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{ },
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};
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static struct platform_driver pmc_driver = {
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.driver = {
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.name = "fsl-pmc",
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.owner = THIS_MODULE,
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.of_match_table = pmc_ids,
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},
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.probe = pmc_probe,
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};
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static int __init pmc_init(void)
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{
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return platform_driver_register(&pmc_driver);
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}
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device_initcall(pmc_init);
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